This is the theme-director directory containing the theme used as source for
downloading a skeleton to create a new custom specific theme. Usually it is
used as default unmanaged theme as well (used as long as there is no managed 
theme (managed by theme-director) configured. 
It is specified and used to filter out files listed in the manifest 
file chosen, specified by the 
   com.arsdigita.themedirector.default_theme_manifest 
attribute.  

If my be overwritten by a bundle-specific default.